<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <link href="https://cdn.jsdelivr.net/npm/animate.css@3.5.1" rel="stylesheet" type="text/css">
  <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
  <style>
    .box {
      width: 200px;
      height: 200px;
      background: greenyellow;
    }
    .a {
      font-size: 20px;
      color: red;
    }
    .b{
      font-size: 60px;
      color: blue;
    }
    .c{
      transition: all 3s;

    }
  </style>
</head>

<body>

  <div id="app">

    <transition appear appear-class="a" appear-to-class="b" appear-active-class="c">
      <h1>太原2002</h1>
    </transition>


  </div>

  <script>

    const vm = new Vue({
      el: "#app",
      data: {
        isShow: true
      }
    })

  </script>

</body>

</html>